pho.to.ag.ing
n.（名词）The process by which skin is changed or damaged as a result of exposure to ultraviolet radiation in sunlight and other sources.日照老化，光致老化：皮肤因为暴露在太阳或其它光源的紫外线辐射下而受到改变或损害的过程The long-term effects of this process on the skin, as wrinkles, discoloration, or susceptibility to cancer.光致老化现象：光致老化过程对皮肤所造成的长期影响，像是皱纹、变色或是罹患癌症
